A ratchet wrench includes a head with a hole and an engaging ring is rotatably engaged with the hole. In one embodiment, a kit of superior or inferior prostheses is provided, in which the prostheses have at least two dimensions that vary among members of the kit independently of each other. The set of surface features may include elevated polymer surface features andor depressed electrode surface features. The stylus body is retractably and slidably coupled to the stylus barrel. The first application domain and the second application domain execute semi-synchronously and the first privileged domain and the second privileged domain execute semi-synchronously. In particular, the product is capable of important key components of commercial properties such as adhesion, scratch resistance, chemical inertness, and bending without failure.